Two charged particles having charges 1μC and -1μC and of mass 50 g each are held at rest while their separation is 2 m. Now the charges are released. Find the speed of the particles when their separation is 1 m.

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15ms−1

35ms−1

310ms−1

27ms−1

answer is C.

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Detailed Solution

Applying conservation of mechanical energy, we get−9×109×10−122=−9×109×10−121+12(2m)v2or v=3/10 ms−1

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